Refractive Index - Part 2 - The Disappearing Beaker

The video demonstrates the concept of refractive index through an experiment. It begins with an introduction and reference to a previous video for more details. The materials needed are vegetable oil, a large beaker, a small beaker, and a glass stirring rod. The experiment is safe, requiring no protective gear. A control is established using water to observe the glass stirring rod. The main experiment shows how the glass appears to disappear in vegetable oil due to similar refractive indices. The video concludes with observations on how light travels through substances with similar refractive indices, making objects appear invisible.

What materials are required for the refractive index experiment?

• Vegetable oil, a large beaker, a small beaker, and a glass stirring rod

• Water, a large beaker, a small beaker, and gloves

• Water, a small beaker, a glass stirring rod, and a lab coat

• Vegetable oil, a large beaker, a small beaker, and safety goggles

What is the purpose of establishing a control in the experiment?

• To determine the speed of light in water

• To measure the refractive index of water

• To compare the appearance of the glass stirring rod in different liquids

• To ensure the experiment is safe

How does the glass stirring rod appear in vegetable oil compared to water?

• It appears larger in vegetable oil

• It appears smaller in vegetable oil

• It seems to disappear in vegetable oil

• It looks the same in both liquids

Why does the glass stirring rod seem to disappear in vegetable oil?

• The refractive index of vegetable oil is higher than that of glass

• The refractive index of vegetable oil is lower than that of glass

• The refractive index of vegetable oil is similar to that of glass

• The refractive index of vegetable oil is irrelevant

What scientific principle is demonstrated when the small beaker seems to disappear in the large beaker filled with vegetable oil?

• The principle of reflection

• The principle of diffraction

• The principle of refraction

• The principle of buoyancy